fix(app): paste clipboard images on mobile (#2793)

Native composers had no path from the device clipboard into image attachments. Route clipboard data URLs through the existing attachment persistence flow and expose the action only in the native attachment sheet.

packages/app/src/i18n/resources/en.ts

@@ -110,6 +110,7 @@ export const en = {
     },
     attachments: {
       addImage: "Add image",
+      pasteImage: "Paste image",
       addFile: "Upload file",
       addIssueOrPr: "Add issue or PR",
       addIssueOrPr_mr: "Add issue or MR",
@@ -135,6 +136,8 @@ export const en = {
       initialPromptRequired: "Initial prompt is required",
       alreadyLoading: "Already loading",
       uploadFailed: "Failed to upload file",
+      noClipboardImage: "No image in clipboard",
+      pasteImageFailed: "Failed to paste image",
       fileTooLarge: "{{fileName}} is too large (max {{size}})",
     },
     clientCommands: {